Enganchar y desenganchar dobles y triples con dolly convertidor

Preguntas de repaso con respuestas

1. What is a converter dolly? ¿Qué es un dolly convertidor?
   1. A special trailer for hauling cars
   2. A hand truck for loading cargo
   3. A coupling device with one or two axles and a fifth wheel
   4. A device to check air pressure
   Ver respuesta

   A coupling device with one or two axles and a fifth wheel

   A converter dolly has one or two axles and a fifth wheel, used to couple a semitrailer to the rear of a tractor-trailer.

   Tiene uno o dos ejes y una quinta rueda para unir un semirremolque atrás de otro.

2. For the safest handling, where should the more heavily loaded trailer be? Para el manejo más seguro, ¿dónde va el remolque más cargado?
   1. In first position, right behind the tractor
   2. In the rear position
   3. In the middle of a triple only
   4. It does not matter
   Ver respuesta

   In first position, right behind the tractor

   Put the heavier trailer first behind the tractor and the lighter one in the rear.

   El más pesado va primero detrás del tractor y el más ligero atrás.

3. The second trailer has no spring brakes. How can you set its emergency brakes before coupling? El segundo remolque no tiene frenos de resorte. ¿Cómo aplica sus frenos de emergencia antes de enganchar?
   1. Pull the trailer hand valve
   2. Open the shut-off valves
   3. Chain it to the dolly
   4. Connect the emergency line, charge the trailer tank, then disconnect the emergency line
   Ver respuesta

   Connect the emergency line, charge the trailer tank, then disconnect the emergency line

   Charging the tank and then disconnecting the emergency line sets the emergency brakes (if slack adjusters are right).

   Cargar el tanque y desconectar la línea de emergencia aplica los frenos de emergencia.

4. You have doubts about whether the second trailer's emergency brakes will hold. What should you do? Tiene dudas de que los frenos de emergencia del segundo remolque aguanten. ¿Qué hace?
   1. Couple quickly before it rolls
   2. Chock the wheels
   3. Open the petcock
   4. Raise the landing gear
   Ver respuesta

   Chock the wheels

   Chock the wheels if you have any doubt about the brakes.

   Calce las ruedas si tiene cualquier duda sobre los frenos.

5. How do you release the brakes on a converter dolly without spring brakes? ¿Cómo suelta los frenos de un dolly sin frenos de resorte?
   1. Push in the air supply knob
   2. Pull the trolley valve
   3. Open the air tank petcock
   4. Close the shut-off valves
   Ver respuesta

   Open the air tank petcock

   Release dolly brakes by opening the air tank petcock (or use the dolly parking brake control if it has spring brakes).

   Se sueltan abriendo la llave de purga del tanque.

6. How should the trailer height compare with the dolly fifth wheel before you push the dolly under? Antes de meter el dolly, ¿cómo debe estar la altura del remolque?
   1. Slightly lower than the center of the fifth wheel
   2. Slightly higher than the fifth wheel
   3. Exactly level with the top of the jaws
   4. As high as possible
   Ver respuesta

   Slightly lower than the center of the fifth wheel

   The trailer should sit a bit below the center of the dolly's fifth wheel, so the dolly lifts it slightly as it goes under.

   Un poco más baja que el centro de la quinta rueda para que se levante un poco.

7. After backing the dolly under the rear trailer, why raise the landing gear slightly off the ground before the tug test? Tras meter el dolly, ¿por qué subir un poco el landing gear antes de la prueba de jalón?
   1. To check the ABS
   2. To let air into the tanks
   3. To drain moisture
   4. To prevent damage if the trailer moves
   Ver respuesta

   To prevent damage if the trailer moves

   Raising the landing gear slightly prevents damage if the trailer moves during the test.

   Subirlo un poco evita daños si el remolque se mueve.

8. What do you check when making a visual check of the dolly coupling? ¿Qué revisa en la revisión visual del enganche del dolly?
   1. That the ABS lamp is lit
   2. No space between upper and lower fifth wheel and the locking jaws closed on the kingpin
   3. That the landing gear is on the ground
   4. That the glad hands are crossed
   Ver respuesta

   No space between upper and lower fifth wheel and the locking jaws closed on the kingpin

   Look for no gap between the upper and lower fifth wheel, and for jaws closed on the kingpin.

   Sin espacio entre las quintas ruedas y mordazas cerradas en el kingpin.

9. After coupling the second trailer, which valves should you close? Después de enganchar el segundo remolque, ¿qué válvulas cierra?
   1. The shut-off valves at the rear of the first trailer
   2. All shut-off valves
   3. The dolly air tank petcock and the shut-off valves at the rear of the second trailer
   4. None
   Ver respuesta

   The dolly air tank petcock and the shut-off valves at the rear of the second trailer

   Close the dolly petcock and the rear shut-offs of the second (last) trailer; open those on the first trailer.

   Cierre la llave del dolly y las de atrás del segundo (último) remolque; abra las del primero.

10. After charging the trailer brakes, how do you check that air reaches the second trailer? Tras cargar los frenos, ¿cómo comprueba que llega aire al segundo remolque?
    1. Open the emergency line shut-off at the rear of the second trailer
    2. Look at the dash gauge only
    3. Pull the dolly petcock
    4. Tug against the kingpin
    Ver respuesta

    Open the emergency line shut-off at the rear of the second trailer

    Open the emergency line shut-off at the rear of the second trailer; no air means the brakes won't work.

    Abra la válvula de emergencia atrás del segundo remolque; sin aire, no hay frenos.

11. What three things connect the dolly and trailers besides the coupling itself? ¿Qué tres cosas se conectan entre dolly y remolques además del enganche?
    1. Landing gear, crank and chocks
    2. ABS lamp, ECU and sensors
    3. Mud flaps, reflectors and tires
    4. Safety chains, air hoses and light cords
    Ver respuesta

    Safety chains, air hoses and light cords

    Connect safety chains, air hoses and light cords.

    Se conectan cadenas de seguridad, mangueras y cables de luces.

12. When uncoupling the rear trailer, where should you park the rig? Al desenganchar el remolque trasero, ¿dónde estaciona?
    1. On a slight hill
    2. In a straight line on firm, level ground
    3. On soft ground to cushion the landing gear
    4. In a curve so you can see the trailer
    Ver respuesta

    In a straight line on firm, level ground

    Park in a straight line on firm, level ground.

    Estacione en línea recta sobre suelo firme y plano.

13. When uncoupling doubles, why lower the second trailer's landing gear before pulling the dolly out? Al desenganchar dobles, ¿por qué bajar el landing gear del segundo remolque antes de sacar el dolly?
    1. To drain the tanks
    2. To lock the pintle hook
    3. To remove some weight from the dolly
    4. To turn on the ABS
    Ver respuesta

    To remove some weight from the dolly

    Lower the landing gear enough to take some weight off the dolly.

    Bájelo lo suficiente para quitar algo de peso al dolly.

14. Why should you pull the dolly out from under the rear trailer before disconnecting it from the trailer in front? ¿Por qué sacar el dolly de debajo del remolque trasero antes de soltarlo del remolque de adelante?
    1. If you unlock the pintle hook with the dolly under the trailer, the tow bar may fly up
    2. The dolly brakes will lock
    3. The ABS will turn off
    4. The rear trailer will roll away
    Ver respuesta

    If you unlock the pintle hook with the dolly under the trailer, the tow bar may fly up

    Unlocking the pintle hook while the dolly is still under the rear trailer can make the tow bar spring up and hurt you.

    Nunca suelte el pintle con el dolly debajo; la lanza puede saltar y lastimarlo.

15. Before releasing the pintle hook to uncouple the dolly, what should you do? Antes de soltar el pintle para desenganchar el dolly, ¿qué hace?
    1. Open the shut-off valves
    2. Raise the dolly landing gear
    3. Connect the safety chains
    4. Apply the converter gear spring brakes or chock the wheels
    Ver respuesta

    Apply the converter gear spring brakes or chock the wheels

    Lower the dolly landing gear, disconnect the chains, set the dolly spring brakes or chock, then release the pintle hook.

    Baje el soporte, quite las cadenas, aplique frenos o calce, y luego suelte el pintle.

16. When uncoupling the rear trailer, what do you do with the air shut-offs at the rear of the first trailer? Al desenganchar el remolque trasero, ¿qué hace con las válvulas atrás del primer remolque?
    1. Open them
    2. Close them
    3. Remove them
    4. Leave them as they are
    Ver respuesta

    Close them

    Close the air shut-offs at the rear of the first trailer (and on the dolly, if equipped).

    Cierre las válvulas atrás del primer remolque (y en el dolly, si tiene).

17. When uncoupling a triple-trailer rig, which trailer do you uncouple first? Al desenganchar un triple, ¿qué remolque se desengancha primero?
    1. The first trailer
    2. The second trailer
    3. The third trailer
    4. Any order is fine
    Ver respuesta

    The third trailer

    Uncouple the third trailer first by pulling the dolly out, then unhitching the dolly.

    Primero el tercero, sacando el dolly y luego soltándolo.

18. For truck-trailer combinations not covered in the manual, how should you learn to couple and uncouple? Para combinaciones no cubiertas en el manual, ¿cómo aprende a enganchar?
    1. From the manufacturer and/or owner specifications
    2. By trial and error
    3. From other drivers only
    4. Use the tractor-semitrailer method for all
    Ver respuesta

    From the manufacturer and/or owner specifications

    Learn the correct method for your vehicle from the manufacturer and/or owner specifications.

    Aprenda el método correcto según el fabricante y/o el dueño.